characin

characin

(kâr`əsĭn) or

characid

(–sĭd), common name for members of the Characidae, a large and diverse family comprising 700 species of freshwater fishes. The characins are related to the carp and the catfish. They are found in Africa and in tropical America, especially in the Amazon. Most species are active and predacious. Most notorious are the piranhas, or caribes (Serrasalmus species), although some authorities class these in a separate family, Serrasalmidae. With their powerful jaws and razor-sharp triangular teeth, piranhas are capable of killing humans and cattle, though such deadly attacks are rare. Various small, colorful characin species, called tetras, are used in aquariums. A small characin found in Mexican streams is interesting for the stages of blindness it exhibits: those living deep in caves are eyeless; those found near the entrance have imperfect eyes; and the specimens living in open water have normal eyes. A cross of a blind with a normal specimen produces offspring with varying degrees of eye degeneracy. Characins are classified in the phylum ChordataChordata, phylum of animals having a notochord, or dorsal stiffening rod, as the chief internal skeletal support at some stage of their development. Most chordates are vertebrates (animals with backbones), but the phylum also includes some small marine invertebrate animals......Click the link for more information., class Actinopterygii, order Cypriniformes, family Characidae.

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